update_hosts_adblock.patched

#!/bin/bash

# VARIABLES
FILE_LENGTH=12000
FILE_EXTENSION=".editable"
TMP_FILE="/tmp/hosts.txt"
# Selecting the "unified" hosts blocking list from <https://github.com/StevenBlack/hosts> (picking the basic list, as the extended ones tend to block too eagerly):
REMOTE_HOSTS="https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts"
NATIVE_HOSTS="/etc/hosts"
ANDROID_DIR_1="/system/etc"
ANDROID_HOSTS_1="/system/etc/hosts"
ANDROID_DIR_2="/opt/alien/system/etc"
ANDROID_HOSTS_2="/opt/alien/system/etc/hosts"

# FUNCTIONS
# 127.0.0.1                   localhost

function recreate_file {
    if [[ $1 == *"$ANDROID_HOSTS_1"* ]]; then
        echo "127.0.0.1                   localhost" > $1
    else
        echo "127.0.0.1               localhost.localdomain localhost" > $1
        echo "::1             localhost6.localdomain6 localhost6" >> $1
    fi
}

function check_mvps {
    if grep -q "MVPS" $1; then
        file_lines=`wc -l $1 | cut -f1 -d' '`
        if [ $file_lines -gt $FILE_LENGTH ]; then
            return 0
        else
            return 1
        fi
    else
        return 1
    fi
}


function update_file {
    # Check if the new file exists. If not, download it.
    if [ ! -f $TMP_FILE ]; then
        # Download hosts file
        curl -o $TMP_FILE $REMOTE_HOSTS
    fi

    # Check if the /etc/hosts file exists - just in case a removal of other packages deleted it.
    # If it does not exist, recreate it.
    if [ ! -f $1 ]; then
        recreate_file $1
    fi

    # Check if our editable/backup file exists. If not
    if [ ! -f $1$FILE_EXTENSION ]; then
        # Check if it is not the MVPS hosts file. If it is, recreate hosts from scratch.
        cp $1 $1$FILE_EXTENSION
    fi

    # Check if the hosts file is really the one from mvps.org. If not (Jolla update), treat it as the default one.
    if ! check_mvps $1; then
        cp -f $1 $1$FILE_EXTENSION
    fi

    # Check if we have not copied the MVPS file into the /etc/hosts.editable file
    # If so, recreate the file from scratch.
    if check_mvps $1$FILE_EXTENSION; then
        recreate_file $1$FILE_EXTENSION
    fi



    # Check if the downloaded file is the MVPS file and do not act if not.
    if check_mvps $TMP_FILE; then
        cp -f $1$FILE_EXTENSION $1

        # Add divider to the file
        echo "" >> $1
        echo "# Autogenerated by the sailfishos-hosts-adblock app with the \"unified\" hosts blocking list from <https://github.com/StevenBlack/hosts>" >> $1
        echo "" >> $1

        # Sanitize and add to hosts
        grep -e '^0.0.0.0\|^#' $TMP_FILE >> $1
    fi
}

# Native hosts
echo "Updating native hosts 1/2"
update_file $NATIVE_HOSTS

# Android hosts (only if the folder exists)
# 1st file
if [ -d $ANDROID_DIR_1 ]; then
    echo "Updating Android hosts 1/2"
    update_file $ANDROID_HOSTS_1
fi
# 2nd file
if [ -d $ANDROID_DIR_2 ]; then
    echo "Updating Android hosts 2/2"
    update_file $ANDROID_HOSTS_2
fi

rm -f $TMP_FILE